Bah, you empiralist races. Just watch out for my race of suicidal Lemmingmen. Once he reaches maturity, every Lemmingman embarks on a quest through the cosmos to find the most amazing way to get killed. If you detect a Lemmingman's spacecraft headed for your star, better make some quick evacuation plans. If you make a zoo planet, expect visitors dressed in meat. And be careful flying in some regions, a few years back there was a shooting-yourself-into-space-out-of-a-cannon fad, and some sectors were left utterly unnavigable.
If I encounter a Naucean, I am sure my Lemmingman will behave just like he would in a first encounter with any new race. Insult their mothers, make faces, and paint a bulls-eye on his chest.